An incoming fee or revenue, especially one of an occasional or incidental character. Chiefly in plural.
Late Middle English; earliest use found in The Book of the Foundation of St. Bartholomew's Church in London. From Anglo-Norman obvencion, obvencyoun and Middle French obvention fee, revenue or their etymon classical Latin obventiōn-, obventiō (early 3rd cent. a.d. in legal texts, frequently in plural) from obvent-, past participial stem of obvenīre + -iō.